Răspuns:
[tex]5 \times (2x + 5) + 19 = 82 \\ 10x - 25 + 19 = 82 \\ 10x - 6 = 82 \\ 10x = 82 + 6 \\ 10x = 88 \\ x = \frac{44}{5} [/tex]
[tex]7 \times (3x - 5) + 23 = 114 \\ 21x - 35 + 23 = 114 \\ 21x = 114 + 12 \\ 21x = 126 \\ x = 6[/tex]
[tex](4x + 5) \div 13 + 36 = 41 \\ \frac{4x + 5}{13} + 36 = 41 \\ 4x + 5 + 468 = 533 \\ 4x + 473 = 533 \\ 4x = 533 - 473 \\ 4x = 60 \\ x = 15[/tex]
[tex](3x - 11) \div 2 + 12 = 20 \\ \frac{3x - 11}{2} + 12 = 20 \\ 3x - 11 + 24 = 40 \\ 3x + 13 = 40 \\ 3x = 40 - 13 \\ 3x = 27 \\ x = 9[/tex]
